title: Na3V2O2(PO4)2F/graphene sandwich structure for high-performance cathode of a sodium-ion battery.
abstract: A Na3V2O2(PO4)2F/reduced-graphene-oxide (RGO) sandwich structure has been synthesized by a facile one-step solvothermal method. Cubic Na3V2O2(PO4)2F nanoparticles are homogeneously trapped between conductive RGO sheets during its growth and assembled into a compact sandwich structure, which allows the electrically insulating Na3V2O2(PO4)2F nanoparticles to be wired up to a current collector through the underlying graphene conducting layers. As a sodium-insertion cathode material, the structure exhibits a high reversible capacity of 120 mA h g(-1) at a discharge rate of C/20 with a capacity retention of 100.4 mA h g(-1) at 1 C and an excellent cyclic retention of 91.4% after the 200th cycle at C/10. These results highlight the importance of anchoring Na3V2O2(PO4)2F on a conducting scaffold for maximum utilization of the electrochemically active Na3V2O2(PO4)2F particles in a high-performance sodium-ion battery.
authors.affiliation: Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: Maowen
authors.initials: M
authors.lastname: Xu
authors.forename: Long
authors.initials: L
authors.lastname: Wang
authors.forename: Xin
authors.initials: X
authors.lastname: Zhao
authors.forename: Jie
authors.initials: J
authors.lastname: Song
authors.forename: Hui
authors.initials: H
authors.lastname: Xie
authors.forename: Yuhao
authors.initials: Y
authors.lastname: Lu
authors.forename: John B
authors.initials: JB
authors.lastname: Goodenough